Dud… I m working on building amplifier based on TDA2822 which receives input from my phone and feeds them into a small 2″ speaker provided by 9 v battery.I connected the circuit but am not understanding 1 thing…I bought a new earphone and removed its wires..(cause such wires are not available in my area) then i stripped the insulation of left earphone. I got tho wires inside.I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier.I mean…. I got 2 wires…. One red and one coppery color…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining teo copper wires??The datasheet of TDA822my TDA2822 became too hot after an hour of using it…..so i want to know which amp is small in size but provides undistorted o\p with in voltage 3V and above… it should be ultra small and no external caps, resistance etc…..

ailexs wrote:Dud… I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier.I mean…. I got 2 wires…. One red and one coppery color…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining teo copper wires??The datasheet of TDA822

You have stereo,, so 2 hot signal wires go to pin 1 and 16 and the other 2 ground wires go to Circuit Common or ground. Circuit common is also pin 4,5,12 and 13 on the chip.Pin 6 and 11 are speaker outputs,, Resistor RL is the speaker (Load).The flat line at the bottom of all the passive components is also circuit Common.

ailexs wrote:my TDA2822 became too hot after an hour of using it…..so i want to know which amp is small in size but provides undistorted o\p with in voltage 3V and above… it should be ultra small and no external caps, resistance etc…..

Small chips on low voltage are unlikely to give a clean output especially with big distortion and booster pedal circuits.I doubt many exist, most chip amps require some external passives to work.

ailexs wrote:and which is best small amp??

Other may know more about that, at such small power it's hardly worth trying to improve.Phil.

I was at a cousins house and he had this adopter thing which was like a small piece of metal that you plug your headphones into and the n plug it into the amp. his came in a kit his mom bought him so he don't know what they are called. please help me find this.... it didn't look like it'd cost more then 5 bucks. link please?

rymonsandy wrote:I was at a cousins house and he had this adopter thing which was like a small piece of metal that you plug your headphones into and the n plug it into the amp. his came in a kit his mom bought him so he don't know what they are called. please help me find this.... it didn't look like it'd cost more then 5 bucks. link please?

Why don't you ask your cousin, or his mom?Surely the amp had a headphone output, if you connect it to the speaker output, it will blow up half of your headphones.

"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)